Physics114A_L16 - Physics 114C - Mechanics Lecture 16...

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Physics 114C - Mechanics Lecture 16 (Walker: Ch. 7.1-2) February 3, 2011 John G. Cramer Professor Emeritus, Department of Physics B451 PAB jcramer@uw.edu
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February 3, 2011 Physics 114A - Lecture 16 2/28 Announcements HW#4 is due at 11:59 PM on Thursday, February 3 (Tonight!).  HW#5 is due at  11:59 PM on Thursday, February 10. As of today  206/208  clickers are registered.  Recent clicker numbers and cumulative  scores as of Friday, January 28 (20 max) are posted on WebAssign.  Check yours. Physics 114A now has a UW GoPost discussion board at:  https://catalyst.uw.edu/gopost/board/jcramer/20670/   We will have Exam 2 on Friday, February 11.  It will cover Chapters 5-8 and will  be similar to Exam 1 in its structure.  There will again be assigned seating.  If you  have not already done so and would like to request a left-handed seat, right-handed  aisle seat, or front row seat, E-mail your request to me ASAP.
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February 3, 2011 Physics 114A - Lecture 16 3/28 Lecture Schedule (Part 2) We are here. Physics 114A - Introduction to Mechanics Lecture: Professor John G. Cramer Textbook: Physics, Vol. 1 (UW Edition), James S. Walker Week Date L# Lecture Topic Pages Slides Reading HW Due Lab 4 24-Jan-11 10 Newton's Laws 14 29 5-1 to 5-4 1-D Dynamics 25-Jan-11 11 Common Forces 11 31 5-5 to 5-7 27-Jan-11 12 Free Body Diagrams - 24 - HW3 28-Jan-11 13 Friction 9 27 6-1 5 31-Jan-11 14 12 26 6-2 to 6-4 Newton's Laws Tension 1-Feb-11 15 Circular Motion 5 30 6-5 3-Feb-11 16 11 23 7-1 to 7-2 HW4 4-Feb-11 17 7 25 7-3 to 7-4 6 7-Feb-11 18 Potential Energy 10 26 8-1 to 8-2 Work-energy 8-Feb-11 19 Energy Conservation I 16 18 8-3 to 8-5 10-Feb-11 R2 Review & Extension - 44 - HW5 11-Feb-11 E2 EXAM 2 - Chapters 5-8
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February 3, 2011 Physics 114A - Lecture 16 4/28 Circular Orbits (1) Thought Experiment:      O n a n a irle s s  plane t,  c a nno n ba lls  a re  s ho t fro m  a  c a nno n m o unte d o n a  to we r  ar inc re as ing  m uzzle   ve lo c itie s , a nd g o  fa rthe r and  fa rthe r a s  the  ve lo c ity is   inc re as e d.     What lim its  the ir ra ng e ?
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February 3, 2011 Physics 114A - Lecture 16 5/28 Circular Orbits (2) ( , toward center) w mg = r ( , toward center) w mg = r 2 ( , toward center) ( ) , so net orbit r orbit F a g m v a g v rg r = = = = = r r 6 2 (6.37 10 m)(9.80 m/s ) 7,900 m/s 16,000 mph orbit v rg = = × =
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February 3, 2011 Physics 114A - Lecture 16 6/28      A s a te llite  m o ve s  a t c o ns ta nt s pe e d in a  c irc ula r o rbit  ab o ut the  c e nte r o f the  Earth a nd ne a r the  s urfa c e  o f  the  Ea rth.  If the  m ag nitude  o f its  ac c e le ra tio n is   g  =  9.81 m /s 2  and the Earth’s radius is 6,370 km, find: (a) its speed  v ; and (b) the time 
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Physics114A_L16 - Physics 114C - Mechanics Lecture 16...

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